Locking-latch.



PATENTED JUNE 23, 1903.

No. 731,775. I

- LA FOREST w. HALL.

LOCKING LATCH. APPLICATION FILED mm: 21. 1902.

N0 MODEL.

INVENTOR C; Fbrgf 00.955152.

UNITED STAT S Patented June 23, 1909 PATENT ()FFICE.

LOCKING-LATCH SPECIFICATION forming part of Letters Patent N 0. 731,775,dated June 23, 1903.

Application filed June 21. 1902.

M y invention relates to that class of lockingi latches in which asingle pivoted gravitating bolt serves the double'function of latch andlocking-bolt, being especially directed to the mechanism for locking thebolt, and has for its objects to combine in such'mechanism simplicity ofconstruction, facility of operation,

and efficiency in the performance of it-Sfunctions.

To these ends the invention comprises, in combination with a pivotedgravitating bolt, a vertically-disposed finger pivoted above the same, asliding member adapted to swing Said finger into and out of engagementwith the bolt, and operative connections between the sliding member andfinger.

The invention also comprises the details of construction and combinationof parts hereinafter described.

In the accompanying drawings, Figure 1 is a side elevation of a lock,having the side of the casing removed to expose to view the inter nalmechanism embodying my invention, the finger being disengaged from thebolt. Fig. 2 is a similar view showing the finger engagingand lockingthe bolt. Fig. 3 is a similar view of the parts removed from the casingandviewed from the opposite side. Fig. etis a sectional elevation of thebolt and its keeper.

Referring to the drawings, 1 indicates the casing of the lock, adapted,as usual, to inclose' the mechanism of the device and to be insertedinto a mortised Socket in the door.

2 is a gravitating bolt pivoted, as at 3, and.

adapted to Swing on its pivot for engagement or disengagement with thekeeper 4.

5 is a cam member lying beneath the bolt and adapted to be operated bythe usual knobspindle (not shown) to raise the boltfor disengagementwith the keeper, the engagement of the bolt with the keeper being due togravity.

6 is a finger vertically disposed above thebolt and pivoted, asat 7,near its upper end and adapted to swing on its pivot into and out ofSerial No. 112,634. (No model.)

engagement with the bolt for looking or releasing the same.

Sis a link pivoted at one end to the upper end of the finger and at itsopposite end to the horizontally-sliding member 9, which is providedwith an elongated slot 10 in engagement with a similarly-shaped lug 11,formed integral with the casing, which serves to hold the member 9securely in place, but admit of its sliding freely under the action ofkey 12, Which'on being turned in the lock engages with the inclinedfaces or cam-surfaces 13'" and 13 formed by recessing the member 9, asat 13.

lat is a horizontal bar or lever pivoted to the casing back of thesliding member and provided with a lug 15, which engages with a lug 16on the sliding member 9 to lock the latter in either of its twopositions. The arm 14 extends within the path of the key 12, as at 17,so that when the latter is turned in the lock it.will lift the arm,disengaging lugs 15 and 1G, and permit the key in its further movementto operate the sliding member.

. 18 is a spring which exerts a constant downward pull upon the arm andmaintains the lugs normally in engagement.

19 is a lug carried by the sliding member and bearing against the wallof the casing, thus steadying and guiding the member in its movements.

In the operation of locking the bolt, supposing the parts to occupy thepositions shown in Fig. 1, the key is turned to the left and firstengages and raises the arm 14, free- 'ing lug 15 from lug 16. As the keycontinues to turn it contacts with the. outer cam-surface 13 and movesthe sliding member to the right, which in turn, through the medium oflink 8, exerts a pull on the upper end of finger 6, which rocks the sameon its pivot and throws its lower end intoengagement with and locks thebolt 2, as shown in Fig. 2. To unlock the bolt, the key is turned to theright and first raises the arm 14., then contacts with cam-surface 13",and forces theslide to the left, which rocks the finger (i on its pivotand throws its lower end out of engagement with the bolt.

Having thus described my invention, what I claim is-- 1. Ina lock, thecombination with a pivoted bolt, of a depending finger disposed abovethe bolt and pivoted at its upper extremity, a longitudinally slidingmember having a link inovably attached to the upper end of the finger,the said member being formed with a slot having oppositely-disposed camedges for engagement by a key, and means for locking the sliding memberto hold the same in either one oftwo positions.

2. In a lock, the combination with alongitudinally-extending gravitatingbolt, avertically-disposed finger above the bolt and pivoted at itsupper extremity, a slotted sliding member having a link pivoted theretoand Witnesses:

CHAS. A. ESTEY, FRED FARRAND.

